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Changing diet can quickly shift makeup of microbiota

As the saying goes, you are what you eat. But new evidence suggests that the same may also be true for the microbes in your gut.

A Harvard study shows that, in as little as a day, diet can alter the population of microbes in the gut particularly those that tolerate bile—as well as the types of genes expressed by gut bacteria.

“What we are really excited about is we and others have shown in animal models that diet can rapidly have major effects on the microbes that are in the gut,” said Peter Turnbaugh, a Bauer Fellow at the Center for Systems Biology in the Faculty of Arts and Sciences. He is senior author of the paper, which appeared in Dec. 11 edition of the journal Nature.